Edge-burnishing machine.



C. F. STACKPOLE. EUGE BURMSHING MACHINE. APPLICATION mso APR. s. 191s.

Patented Dec. 17,1918.

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. STATES PATENT OFFICE.

CHARLES F. STAGKPOLE, OF LYNN, MASSACHUSETTS.

EDGE-BURNISHIN G- MACHINE.

Lasaaeo. E

Application led April 6, 1916.

To au wem@ may concern.'

Be itknyvn that I, CHARLES F. STACK- POLE, a citizeii of t United States, and resity of Essez'g Commonwealth of 1 h i u'setts, have invented an Improvement4 ge-Burnishing Machines, of which the ftiafwingglescriptiom in connection witli that anyingfdrawings, is a specification, e?" acterson the drawings representingl' e rts il; each of the several views.

This invention relates to mechanisms equipped with reciprocating or vibrating tools for burnishing, or compacting and smoothing, surfaces and ed es of work. More particularly the inventlon has to do with a mechanism of this type specially designed and adapted for use in burnishing the edges of the soles of boots and shoes, commonly known in the trade as edge Setters. The function of this type of device bein to condense and smooth the edges of the 510e sole by a rapid succession of relatively minute rubbing or sliding strokes of the operating tool or iron, it is important for rapid and effective work that the operating tool be vibrated or reciproca/ted at a very high rate of speed. Since the tool is usually operated by a crank or eccentric connection to a rotating driving shaft, it results that when run at this high speed there is a constant minute hammering or jarring in the bearings of the connections winch transmit the reciprocations to the tool so that with even the looseness in these bearings necessary for free operation there is a tendency to press out or extrude the oil from the bearings so that they become dry in a relatively short time `and valso wear at a relatively high rate. It is requisite in a mechanism of this .type to pro vide a yielding element in the mounting of the operating tool so that it can yield ups ward or backward to some small extent as the work is pressed against the tool or iron by the operator, and asfheretofore customarily constructed this yieldingelementhas added considerably to the weight of the'vibrated or reciprecated element carrying the tool so that a relatively large and heavy mass of metal with a correspondingly great momentum has had to be moved with the rapid vibrations of the tool.

A prime object of the present invention is to provide amounting for the hoider or carfier of an edge `setter drbumishing tool wherein provision i.a ..1rxadev fr the' reguisite Specification of Letters Patent.

Patented Dec. 1'7, 1918.

Serial No. 89,372.

resilient yielding upward or backward of the iron or tool by the use of a yielding element which permits a resilient yield of the pivotal mounting for the tool carrier so that neither said resilient element itself or the parts auxiliary thereto are mounted on the vibrating arm or carrier of the tool but are stationary so that the swinging tool arm or carrier can be made relatively light and of small momentum. In accordance with my invention provision is also made for easily and quickly adjusting the tension of this resilient element, if desired, without stopping or interfering with the operation of the tool. In accordance with my invention means is provided whereby the vibrat ing arm carrying the edge setter tool may be connected to be moved positively from its operating shaft in both directions and equipped with a resilient device adapted to hold the shafts or pivots in the connections constantly at one side of the bearings therefor thus preventing any minute pounding or jarring `in these bearings'. The invention will be better understood from vthe following detaileddescription taken in connection with the accompanying drawings and will be thereafter pointed out in the appended claims.

Referring to the drawings:

Figure 1 is a front view of a machine attachment embodying my invention;

Fig. 2 is a side elevation thereof, one side of a double or twin machine being broken away as the two sides are identical; and

Fig. 3 is a view partly in elevation and partly in section on line 3--8 of Fig. 1, with certain elements removed.

Aisuitable base or pedestal 10 is provided with an upright 11 at its top in which is journaled a horizontal shaft 12. The machine is preferably, though not necessarily,

made as a double or twin type in which case the shaft 12would be extended through another upright at the right of that shown 'in ]E`ig.`J Qwvith a set of devices' the duplicate of that to be described, but such duplicate construction being of no rspecial importance the present ease it is not herein shown, the second upright being broken away as rnL jdlicated at 11. The 'shaft 12 is driven by anysuitablezxneens 'such asa belt pulley v13 carrier arm 17 that has an intermediate horizontally extended sleeve 18 fitted for bearing on a pivot pin 19. The pivot pin 19 is lixcd to an arm 20, being shown as clamped thereto by a nut 21. The arm 20 has at its inner end an extended bearing sleeve 22 itted to turn on a pivot pin 23 horizontally set into the base column as indicated at 24. The outer end of the arm 20 is projected out to some little distance beyond the pivot 19 where it is formed with an enlarged head 25, having a passage therethrough for a rod 26 that is pivoted to a bracket 27 at the top of the upright 11 as indicated at 27 and depends therefrom. The head 25 is shown as provided with rounded lugs 28 extending crosswise of the face thereof and fitting correspondingly concaved recesses in a presser block 29 slidably fitted on the rod 26 and acted on by a coil spring 30 also mounted on said rod and reacting against an adjustable nut 3l threaded on the upper portion of said rod. The extent to which the head 25 and hence the arm 20 may be depressed by the spring 30 is limited by a stop nut 32 adjustably threaded on the lower end of the rod 26; the nuts 31 and 32 having suitable lock nuts 33, 34, respectively, associated therewith as is usual. Thus it will be understood that the spring 30 will normally hold the arm 20 and hence the tool carrying arm 17 yieldingly pressed downward as far as permitted by the adjustment of the nut 32 and with a tension determined by the adjustment of the nut 31. The tool carrying arm 17 can thus be made relatively light since it does not have to carry the spring 30 or the mountings and hackings therefor, the operative effect of said spring being transmitted to the tool carrying arm through the pivot pin 19 as will be readily understood. Thus the weight and consequent momentum of the principal vibrating part, i. e., the tool carrying arm 17 is largely reduced. To fur ther reduce and minimize the injurious effects heretofore due to the pounding and jarring due to the momentum of this tool carrier, I provide means whereby the pivot and shaft connections for operating this arm are kept from minute pounding or jarring in their bearings. For this purpose I mount a stout coil spring 35 having a baclr ing and support at one end against a downturned ledge 36 which may be formed in'one with the bracket 27 and pressing at its other end against a block 37 `adjustable 'transversely in the upper'portion of the arm- 17 by means of a follower screw pin 38. Thus by settingl up the screw pin 88 to the requisite extent the spring 35 may be placed under the necessary de bearing in the hnk .15 for the pin 14 constantly pressed against the left 'side ofvsaid pin` as shown, and likewise-keeping. bear ing vpin le constantly .pressed against'4 the of tension to-fhold'wthe right hand side of its bearing in the link 15 as shown in Fig. 1. In this way any working or jarring oi" these' pins in their bearings is prevented and the same action also of course obtains in the bearing of the sleeve 18 on the ivot pin 19. The bracket 27 and its depen in extension 36 is preferably, in case the mac ine is made double, formed as a bar extending across from one tool arm to the other at the other side of the machine as partly indicated in Fig. 2. The working tool or iron is indicated at 39 yieldngly held in the lower end of the tool carrier arm 17 as is usual by suitable means shown as a detent spring 40. It will be understood that the present construction with a single operating tool or iron is adapted for use by cobblers and in repair shops. For shoe fac tory uses the carrier arm 17 will ordinarily be provided with a forked lower end equipped with two irons :1s is usual, and as shown for example in my earlier Patent No. 1,041,692 patented October 15, 1912. It will be understood that the described upward or backward resilient yield of the tool carrier arm which will ordinarily be within limits of about one-eighth of an inch is especially useful when operating on thin, light work, and that the tension of the spring will be correspondingly increased for heavier grades of work.

With the described construction, the size and weight, and consequent momentum of the vibrating parts, is reduced to a minimum since only the tool carrier arm 17 itself and the ltool with the connecting link from the driving shaft are moved and hence the tendency to jarring or minute pounding in the working bearings is minimized. The importance of this in connection with the further provision for spring pressing the pivot pins to one side of their bearings will be appreciated when it is considered that the usual operating speed of these tools is about three thousand reciprocations per minute or upward. By virtue of the present improved features of constructionV I am enabled to largely increase the usual operating speed of the tool with consequently increased capacity for work. I am aware that the invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and I thereore'desire the present embodiment to he considered as illustrative and not restrictive, reference being had to the appended claims rather than to the foregoing description to indi'- cate the scope of the invention.

. Having described my invention, what I claim as new and desi re to secure by Letters Patent is: 1. .Edge burnishing mechanism, comprising a. tool carrier mounted for neclprocation and equipped with an operating toolrmeans having. operating .connections to caidaI ,car-

rier for imparting small amplitude recipro* cations thereto, and means extraneous of said tool carrier and of said connections for causing cooperative elements of the bearings thereof to be pressed constantly to each other yieldingly at the same side thereof.

2. Edge burnishing mechanism, comprising a tool carrier formed as a swingingly mounted arm equipped with an operating tool, a driving shaft having an eccentric and link connection to said arm for operating the same, and a spring pressing upon said arm to cause the bearin s of said link connection to be pressed yiel ingly against each other constantly on the same side whereby jarring or minute pounding in said bearings 1s eliminated.

3. Edge burnishing mechanism, comprising a tool carrier formed as a swingingly mounted arm equipped with an operating tool, a driving shaft having an eccentric and link connection to said arm for operating the same, the spring having a fixed backing and pressing upon said arm to cause the bearings of said link connection to be pressed yieldingly against each other constantly on the same side whereby jarring or minute pounding in said bearings is eliminated, and means for adjusting the tension of said spring.

4. Edge burnishing mechanism, comprising a tool carrier formed as a swingingly mounted arm equipped with an operating tool, a driving shaft to operate said carrier having pivoted operating connections thereto, means for yieldingly holding coperative portions of said pivotal connections constantly pressed together at one side thereof in operation, and means extraneous of said tool carrier arm for yieldingly holding it and the tool carried thereby at a normal forward limit of movement and with a capability of limited yielding backward under pressure of the Work as it is operated on.

In testimony whereof, I have signed my name to this specification.

CHARLES F. STACKPOLE.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patenti.

Washington, D. G. 

